CN112340630B - Emergency hydraulic system - Google Patents
Emergency hydraulic system Download PDFInfo
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- CN112340630B CN112340630B CN202011295133.8A CN202011295133A CN112340630B CN 112340630 B CN112340630 B CN 112340630B CN 202011295133 A CN202011295133 A CN 202011295133A CN 112340630 B CN112340630 B CN 112340630B
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- emergency
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- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 140
- 239000010720 hydraulic oil Substances 0.000 description 44
- 238000000034 method Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/54—Safety gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/24—Operating devices
- B66D5/26—Operating devices pneumatic or hydraulic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Control And Safety Of Cranes (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides an emergency hydraulic system which comprises a hydraulic control system, wherein the hydraulic control system comprises a hydraulic main system and a hydraulic emergency system, and the hydraulic main system comprises a winch, a hydraulic brake, a hydraulic motor, a shuttle valve, a balance valve, a first reversing valve, a second reversing valve, a first ball valve, a lifting oil way AWA port, a descending oil way AWB port, an oil tank port and a brake oil way EMP port; the lifting oil way AWA port is connected with an oil inlet of a balance valve, an oil outlet of the balance valve is connected with one end of a hydraulic motor, a descending oil way AWB port and a brake oil way EMP port are connected with the other end of the hydraulic motor in parallel, an oil return port of the hydraulic motor is connected with an oil tank port, a power output end of the hydraulic motor is connected with a winch, the hydraulic brake is clamped and connected with an output end of the hydraulic motor, a first ball valve is normally closed and connected between the hydraulic motor and the brake oil way EMP port, and the balance valve is connected between the hydraulic motor and the lifting oil way AWA port. The invention has the advantages of safe and stable emergency operation and sufficient braking force.
Description
Technical Field
The invention relates to the technical field of cranes, in particular to an emergency hydraulic system.
Background
In the traditional crane winch, when the winch acts, in the process that a lifting hook ascends or descends after a brake is loosened, the situation that the brake is opened insufficiently due to insufficient pressure of a brake hydraulic oil way occurs, so that the winch brake shakes, the risk that the winch brake brakes again due to insufficient pressure of the brake hydraulic oil way exists, and once the situation that the brake suddenly occurs in the lifting process of the lifting hook, goods can be unhooked; when the winch stops acting, high-pressure oil in an oil way for lifting or descending the lifting hook needs to be discharged, but when the oil way for lifting or descending the lifting hook discharges the pressure, a certain back pressure exists in a brake oil inlet due to the influence of the back pressure, so that the braking force is reduced.
In addition, when the crane is subjected to some uncontrollable factors, such as: when the crane loses power or the power device fails due to lightning stroke, system breakdown and the like, the emergency motor provides power to place the load at a safe position.
Disclosure of Invention
The emergency hydraulic system is safe and stable in emergency operation and sufficient in braking force, when a crane loses power or a power device fails, the emergency motor can be controlled to provide power through the emergency operation system, a load is placed at a safe position, and the emergency operation process is safe and stable.
In order to achieve the purpose, the technical scheme of the invention is as follows: the hydraulic control system comprises a hydraulic main system and a hydraulic emergency system, wherein the hydraulic main system comprises a winch, a hydraulic brake, a hydraulic motor, a shuttle valve, a balance valve, a first reversing valve, a second reversing valve, a first ball valve, a lifting oil way AWA port, a descending oil way AWB port, an oil tank port and a brake oil way EMP port.
The lifting oil way AWA port is connected with an oil inlet of a balance valve, an oil outlet of the balance valve is connected with one end of a hydraulic motor, a descending oil way AWB port and a brake oil way EMP port are connected with the other end of the hydraulic motor in parallel, an oil return port of the hydraulic motor is connected with an oil tank port, a power output end of the hydraulic motor is connected with a winch, the hydraulic brake is clamped and connected with an output end of the hydraulic motor, a first ball valve is normally closed and connected between the hydraulic motor and the brake oil way EMP port, and the balance valve is connected between the hydraulic motor and the lifting oil way AWA port.
The first input end of the shuttle valve is connected with an AWA port of a lifting oil path, the second input end of the shuttle valve is connected with an AWB port of a descending oil path, the first reversing valve and the second reversing valve are two-position two-way hydraulic reversing valves, signal oil paths of the first reversing valve and the second reversing valve are connected with the output end of the shuttle valve in parallel, an oil inlet of the first reversing valve is connected between an EMP port of a brake oil path and a first ball valve, output oil ports of the first reversing valve and the second reversing valve are connected with a hydraulic brake in parallel, and oil return ports of the first reversing valve and the second reversing valve are connected with an oil tank oil port in parallel; an oil inlet of the second reversing valve is not communicated; the reversing pressure values set by the first reversing valve and the second reversing valve are smaller than the pressure required by hydraulic brake release, and the pressure required by the hydraulic brake release is smaller than the oil supply pressure of the first input end or the second input end of the shuttle valve.
And a normally open fourth ball valve is connected between the second input end of the shuttle valve and the AWB port of the descending oil way.
The hydraulic emergency system comprises an overflow valve and an electromagnetic directional valve, wherein a P port of the electromagnetic directional valve is connected with an oil outlet of an emergency hydraulic pump driven by an emergency motor, an O port of the electromagnetic directional valve is connected with an oil tank port, a B port of the electromagnetic directional valve is connected with an EMP port of a brake oil way, an A port of the electromagnetic directional valve is connected with the oil tank port, an input end of the overflow valve is connected between the P port of the electromagnetic directional valve and the emergency motor in parallel, and an output end of the overflow valve is connected between the O port of the electromagnetic directional valve and the oil tank port in parallel.
According to the arrangement, when the crane works normally, under the action of the hydraulic motor, hydraulic oil flows through the balance valve from the AWA port of the lifting oil path and then enters the hydraulic motor, the hydraulic oil on the lifting oil path simultaneously flows through the shuttle valve, the output end of the shuttle valve outputs signal oil, the output end of the shuttle valve outputs the signal oil, the signal oil flows to the first reversing valve and the second reversing valve, the first reversing valve and the second reversing valve are reversed, and the hydraulic brake is opened after the hydraulic oil at the EMP port of the brake oil path flows through the first reversing valve, so that the winch performs lifting action; or hydraulic oil respectively enters the hydraulic motor and the shuttle valve from the port of the descending oil path AWB, the hydraulic oil flows through the shuttle valve while supplementing oil for the hydraulic motor, so that the first reversing valve and the second reversing valve are switched, and the hydraulic brake is opened after the hydraulic oil at the port of the braking oil path EMP flows through the first reversing valve, so that the winch descends.
When the winch stops acting, the lifting oil path AWA port or the descending oil path AWB port does not supply oil, the first reversing valve and the second reversing valve reset under the action of the spring, and hydraulic oil of the hydraulic brake enters the oil port of the oil tank so as to be discharged, so that the hydraulic brake is closed; the reversing pressure values set by the first reversing valve and the second reversing valve are smaller than the pressure required by loosening of the hydraulic brake, so that the oil inlet of the hydraulic brake has certain back pressure due to the influence of back pressure when the lifting oil path AWA port or the descending oil path AWB port does not supply oil, and the braking force is reduced. In addition, in order to prevent the hydraulic control reversing valves from being blocked by dirt and being incapable of timely draining hydraulic oil, the hydraulic control reversing valves connected in parallel are arranged, so that when one hydraulic control reversing valve fails, the other hydraulic control reversing valve can drain the hydraulic oil, and therefore when the winch acts, enough pressure can be provided to open the hydraulic brake, and after the winch stops working, the hydraulic brake is quickly reset, the safety and reliability of the brake are guaranteed, and the braking force is sufficient.
When the crane loses power or the power device is in failure, emergency operation is required, the first ball valve is opened, the fourth ball valve is closed, an emergency hydraulic pump driven by an emergency motor pumps hydraulic oil in an oil tank out, the hydraulic oil is supplied to a brake oil way after passing through an electromagnetic directional valve, when the oil pressure is greater than the overflow pressure of the overflow valve in the oil supply process, redundant hydraulic oil overflows from the overflow valve, the emergency hydraulic oil is pumped to an EMP port of the brake oil way, the emergency hydraulic oil is divided into four paths through the first ball valve, the first path flows to the first directional valve, the second path flows to one end of the hydraulic motor, the third path flows to one input of the shuttle valve, the fourth path flows to a control end of a balance overflow valve through the third ball valve and a one-way throttle valve, the hydraulic oil flowing into the shuttle valve controls the first directional valve and the second directional valve to change directions, and at the moment, the hydraulic brake is opened by the hydraulic oil passing through the first directional valve, the descending motion of the hydraulic motor corresponding to the steel wire rope on the winch is realized, and the hydraulic oil flowing through the hydraulic motor flows back to the oil tank from the balance valve and the AWA port of the lifting oil cylinder.
After the emergency operation is completed, the emergency main switch, the reversing switch, the second main switch and the first main switch are sequentially switched off, so that the coil of the relay KM is powered off, the main contact of the relay KM and the auxiliary contact moving switch of the relay KM are switched off, the auxiliary contact moving switch of the relay KM is switched on, the electromagnetic reversing valve is reset, the emergency motor is powered off and unloaded, the hydraulic brake is switched off, the winch stops acting, and the emergency operation is completed.
According to the technical scheme, the emergency motor pumps out hydraulic oil in the oil tank to provide emergency hydraulic oil for the hydraulic system, in the process, the winch brake can be opened timely, driving hydraulic oil can be provided for the hydraulic motor to descend, and control oil can be provided for the control end of the balance overflow valve, so that the backpressure of the balance overflow valve is increased, the winch slowly descends, and safety accidents caused by rapid descending of goods or people after the system is out of control are avoided.
After the load is placed at the safe position, the emergency motor stops working, so that the brake pressure is sufficient, safe and stable during emergency operation.
Furthermore, the balance valve comprises a balance check valve and a balance overflow valve, an oil outlet of the balance check valve is connected with an oil inlet of the balance overflow valve, and a pressure relief port of the balance overflow valve is connected with an EMP port of the brake oil path.
Furthermore, a throttle valve is connected between an oil outlet of the balance check valve and an oil inlet of the balance overflow valve, and the other end of the throttle valve is connected with an adjustable throttle valve.
Further, one end of the adjustable throttle valve is connected with a second ball valve.
Furthermore, a pressure measuring point is arranged between the output ports of the first reversing valve and the second reversing valve and the hydraulic brake, and the pressure measuring point is arranged above the hydraulic brake, so that whether the oil pressure of the hydraulic brake reaches the standard pressure or not can be conveniently observed.
Furthermore, a one-way throttling point is connected between the control end of the balance overflow valve and the first ball valve, the other end of the one-way throttling point is connected with a third ball valve, and the third ball valve is connected with the one-way throttling point in series.
Further, the first reversing valve and the second reversing valve are two-position four-way hydraulic reversing valves.
Furthermore, a normally closed emergency ball valve is connected between the port B of the electromagnetic directional valve and the port EMP of the brake oil way.
Further, the hydraulic motor is a bidirectional hydraulic motor.
Drawings
Fig. 1 is a schematic diagram of a hydraulic main system of the hydraulic system of the present invention.
Fig. 2 is a schematic diagram of an emergency system of the hydraulic system of the present invention.
Fig. 3 is a partially enlarged schematic view of a portion a of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 3, the emergency hydraulic system comprises a hydraulic control system, the hydraulic control system comprises a hydraulic main system 21 and a hydraulic emergency system 22, the hydraulic main system 21 comprises a winch 211, a hydraulic brake 212, a hydraulic motor 213, a shuttle valve 214, a balance valve 215, a first reversing valve 216, a second reversing valve 217, a first ball valve 2181, a lifting oil path AWA port, a descending oil path AWB port, an oil tank port 210 and a brake oil path EMP port.
An AWA port of the lifting oil path is connected with an oil inlet of the balance valve 215, an oil outlet of the balance valve 215 is connected with one end of the hydraulic motor 213, a descending oil path AWB port and an EMP port of the brake oil path are connected with the other end of the hydraulic motor 213 in parallel, an oil return port of the hydraulic motor 213 is connected with an oil tank oil port 210, a power output end of the hydraulic motor 213 is connected with a winch, the hydraulic brake 212 is connected with an output end of the hydraulic motor 213 in a clamping mode, a first ball valve 2181 is connected between the hydraulic motor 213 and the EMP port of the brake oil path in a normally-closed mode, and the balance valve 215 is connected between the hydraulic motor 213 and the AWA port of the lifting oil path.
A first input end of the shuttle valve 214 is connected with a lifting oil path AWA port, a second input end of the shuttle valve 214 is connected with a descending oil path AWB port, the first reversing valve 216 and the second reversing valve 217 are two-position two-way hydraulic reversing valves, signal oil paths of the first reversing valve 216 and the second reversing valve 217 are connected with an output end of the shuttle valve 214 in parallel, an oil inlet of the first reversing valve 216 is connected between a brake oil path EMP port and a first ball valve, output oil ports of the first reversing valve 216 and the second reversing valve 217 are connected with a hydraulic brake 212 in parallel, and oil return ports of the first reversing valve 216 and the second reversing valve 217 are connected with an oil tank oil port 210 in parallel; the oil inlet of the second reversing valve 217 is not communicated; the first and second directional valves 216 and 217 set a directional pressure value less than a pressure required to release the hydraulic brake 212, and the pressure required to release the hydraulic brake 212 is less than the supply pressure of the first or second input of the shuttle valve 214. And a normally open fourth ball valve 2185 is connected between the second input end of the shuttle valve 214 and the port of the descending oil path AWB.
The hydraulic emergency system 22 comprises an overflow valve 221 and an electromagnetic directional valve 222, a P port 2221 of the electromagnetic directional valve 222 is connected with an oil outlet of an emergency hydraulic pump 11 driven by an emergency motor 1, an O port 2222 of the electromagnetic directional valve 222 is connected with an oil tank oil port 210, a B port 2223 of the electromagnetic directional valve 222 is connected with a brake oil path EMP port, an A port 2224 of the electromagnetic directional valve 222 is connected with the oil tank oil port 210, an input end of the overflow valve 221 is connected between the P port 2221 of the electromagnetic directional valve 13 and the emergency motor 1 in parallel, and an output end of the overflow valve 221 is connected between the O port 2222 of the electromagnetic directional valve 13 and the oil tank oil port 210 in parallel.
According to the arrangement, when the crane works normally, under the action of the hydraulic motor, hydraulic oil flows through the balance valve from the AWA port of the lifting oil path and then enters the hydraulic motor, the hydraulic oil on the lifting oil path simultaneously flows through the shuttle valve, the output end of the shuttle valve outputs signal oil to enable the first reversing valve and the second reversing valve to reverse, and the hydraulic oil at the EMP port of the brake oil path opens the hydraulic brake after flowing through the first reversing valve to enable the winch to ascend; or hydraulic oil respectively enters the hydraulic motor and the shuttle valve from the port of the descending oil path AWB, the hydraulic oil flows through the shuttle valve while supplementing oil for the hydraulic motor, the output end of the shuttle valve outputs signal oil, the signal oil flows to the first reversing valve and the second reversing valve to enable the first reversing valve and the second reversing valve to change positions, and the hydraulic brake is opened after the hydraulic oil at the port of the brake oil path EMP flows through the first reversing valve to enable the winch to descend.
When the winch stops acting, the lifting oil path AWA port or the descending oil path AWB port does not supply oil, the first reversing valve and the second reversing valve reset under the action of the spring, and hydraulic oil of the hydraulic brake enters the oil port of the oil tank so as to be discharged, so that the hydraulic brake is closed; the reversing pressure values set by the first reversing valve and the second reversing valve are smaller than the pressure required by loosening of the hydraulic brake, so that the oil inlet of the hydraulic brake has certain back pressure due to the influence of back pressure when the lifting oil path AWA port or the descending oil path AWB port does not supply oil, and the braking force is reduced. In addition, in order to prevent the hydraulic control reversing valves from being blocked by dirt and being incapable of timely draining hydraulic oil, the hydraulic control reversing valves connected in parallel are arranged, so that when one hydraulic control reversing valve fails, the other hydraulic control reversing valve can drain the hydraulic oil, and therefore when the winch acts, enough pressure can be provided to open the hydraulic brake, and after the winch stops working, the hydraulic brake is quickly reset, the safety and reliability of the brake are guaranteed, and the braking force is sufficient.
When the crane loses power or the power device is in failure, emergency operation is required, the first ball valve is opened, the fourth ball valve is closed, an emergency hydraulic pump driven by an emergency motor pumps hydraulic oil in an oil tank out, the hydraulic oil is supplied to a brake oil way after passing through an electromagnetic directional valve, when the oil pressure is greater than the overflow pressure of the overflow valve in the oil supply process, redundant hydraulic oil overflows from the overflow valve, the emergency hydraulic oil is pumped to an EMP port of the brake oil way, the emergency hydraulic oil is divided into four paths through the first ball valve, the first path flows to the first directional valve, the second path flows to one end of the hydraulic motor, the third path flows to one input of the shuttle valve, the fourth path flows to a control end of a balance overflow valve through the third ball valve and a one-way throttle valve, the hydraulic oil flowing into the shuttle valve controls the first directional valve and the second directional valve to change directions, and at the moment, the hydraulic brake is opened by the hydraulic oil passing through the first directional valve, the descending motion of the hydraulic motor corresponding to the steel wire rope on the winch is realized, and the hydraulic oil flowing through the hydraulic motor flows back to the oil tank from the balance valve and the AWA port of the lifting oil cylinder.
After the emergency operation is completed, the emergency main switch, the reversing switch, the second main switch and the first main switch are sequentially switched off, so that the coil of the relay KM is powered off, the main contact of the relay KM and the auxiliary contact moving switch of the relay KM are switched off, the auxiliary contact moving switch of the relay KM is switched on, the electromagnetic reversing valve is reset, the emergency motor is powered off and unloaded, the hydraulic brake is switched off, the winch stops acting, and the emergency operation is completed.
According to the technical scheme, the emergency motor pumps out hydraulic oil in the oil tank to provide emergency hydraulic oil for the hydraulic system, in the process, the winch brake can be opened timely, driving hydraulic oil can be provided for the hydraulic motor to descend, and control oil can be provided for the control end of the balance overflow valve, so that the backpressure of the balance overflow valve is increased, the winch slowly descends, and safety accidents caused by rapid descending of goods or people after the system is out of control are avoided.
After the load is placed at the safe position, the emergency motor stops working, so that the brake pressure is sufficient, safe and stable during emergency operation.
In this embodiment, the balance valve 215 includes a balance check valve 2151 and a balance overflow valve 2152, an oil outlet of the balance check valve 2151 is connected to an oil inlet of the balance overflow valve 2152, and a pressure relief port of the balance overflow valve 2152 is connected to an EMP port of the brake oil path.
A throttle valve 2153 is connected between the oil outlet of the balance check valve 2151 and the oil inlet of the balance overflow valve 2152, and an adjustable throttle valve 2154 is connected to the other end of the throttle plug 2153.
One end of the adjustable throttle valve 2154 is connected with a normally closed second ball valve 2182.
And a pressure measuring point 2121 is arranged between the output ports of the first reversing valve 216 and the second reversing valve 217 and the hydraulic brake 212, so that whether the oil pressure of the hydraulic brake 2 reaches the standard pressure or not can be conveniently observed.
A one-way throttle valve 2155 is connected between the control end of the balance overflow valve 2152 and the first ball valve 2181 in series, the other end of the one-way throttle valve 2155 is connected with a normally-open third ball valve 2183, and the third ball valve 2183 is connected with the one-way throttle valve 2155 in series.
The electromagnetic directional valve 13 is a two-position four-way electromagnetic directional valve.
And a normally closed emergency ball valve 2184 is connected between the port B of the electromagnetic directional valve 13 and the port EMP of the brake oil way.
The hydraulic motor 3 is a bidirectional hydraulic motor.
Because the first ball valve, the second ball valve, the third ball valve, the throttle valve, the adjustable throttle valve and the one-way throttle valve are arranged, when oil is supplied to the AWA opening of the lifting oil path, the second ball valve can be opened, hydraulic oil input to the hydraulic motor is discharged through the throttle valve, the adjustable throttle valve and the second ball valve, and the lifting speed can be adjusted. If the descending oil way AWB port supplies oil, part of hydraulic oil enters the control end from the third ball valve and the balance check valve, extra back pressure is provided for the balance overflow valve, therefore, the descending is more balanced, meanwhile, the second ball valve can be opened, back pressure is provided for the return oil of the hydraulic motor through the second ball valve, the adjustable throttle valve and the throttle valve, and the descending is further more gentle.
Claims (9)
1. An emergency hydraulic system, characterized in that: the hydraulic control system comprises a hydraulic control system and a hydraulic emergency system, wherein the hydraulic control system comprises a hydraulic main system and a hydraulic emergency system, and the hydraulic main system comprises a winch, a hydraulic brake, a hydraulic motor, a shuttle valve, a balance valve, a first reversing valve, a second reversing valve, a first ball valve, a lifting oil path AWA port, a descending oil path AWB port, an oil tank port and a brake oil path EMP port;
an AWA port of a lifting oil path is connected with an oil inlet of a balance valve, an oil outlet of the balance valve is connected with one end of a hydraulic motor, an AWB port of a descending oil path and an EMP port of a brake oil path are connected with the other end of the hydraulic motor in parallel, an oil return port of the hydraulic motor is connected with an oil port of an oil tank, a power output end of the hydraulic motor is connected with a winch, a hydraulic brake is connected with an output end of the hydraulic motor in a clamping manner, a first ball valve is connected between the hydraulic motor and the EMP port of the brake oil path in a normally-closed manner, and the balance valve is connected between the hydraulic motor and the AWA port of the lifting oil path;
the first input end of the shuttle valve is connected with an AWA port of a lifting oil path, the second input end of the shuttle valve is connected with an AWB port of a descending oil path, the first reversing valve and the second reversing valve are two-position two-way hydraulic reversing valves, signal oil paths of the first reversing valve and the second reversing valve are connected with the output end of the shuttle valve in parallel, an oil inlet of the first reversing valve is connected between an EMP port of a brake oil path and a first ball valve, output oil ports of the first reversing valve and the second reversing valve are connected with a hydraulic brake in parallel, and oil return ports of the first reversing valve and the second reversing valve are connected with an oil tank oil port in parallel; an oil inlet of the second reversing valve is not communicated; reversing pressure values set by the first reversing valve and the second reversing valve are smaller than pressure required by hydraulic brake release, and the pressure required by the hydraulic brake release is smaller than oil supply pressure of the first input end or the second input end of the shuttle valve;
a normally open fourth ball valve is connected between the second input end of the shuttle valve and the AWB port of the descending oil path;
the hydraulic emergency system comprises an overflow valve and an electromagnetic directional valve, wherein a P port of the electromagnetic directional valve is connected with an oil outlet of an emergency hydraulic pump driven by an emergency motor, an O port of the electromagnetic directional valve is connected with an oil tank port, a B port of the electromagnetic directional valve is connected with an EMP port of a brake oil way, an A port of the electromagnetic directional valve is connected with the oil tank port, an input end of the overflow valve is connected between the P port of the electromagnetic directional valve and the emergency motor in parallel, and an output end of the overflow valve is connected between the O port of the electromagnetic directional valve and the oil tank port in parallel.
2. The emergency hydraulic system of claim 1, wherein: the balance valve comprises a balance check valve and a balance overflow valve, an oil outlet of the balance check valve is connected with an oil inlet of the balance overflow valve, and a pressure relief port of the balance overflow valve is connected with an EMP port of the brake oil path.
3. The emergency hydraulic system of claim 2, wherein: a throttle valve is connected between the oil outlet of the balance check valve and the oil inlet of the balance overflow valve, and the other end of the throttle valve is connected with an adjustable throttle valve.
4. An emergency hydraulic system according to claim 3, wherein: one end of the adjustable throttle valve is connected with a second ball valve.
5. The emergency hydraulic system of claim 1, wherein: and a pressure measuring point is arranged between the output ports of the first reversing valve and the second reversing valve and the hydraulic brake.
6. The emergency hydraulic system of claim 2, wherein: a one-way throttle valve is connected between the control end of the balance overflow valve and the first ball valve in series, the other end of the one-way throttle valve is connected with a third ball valve, and the third ball valve is connected with the one-way throttle valve in series.
7. The emergency hydraulic system of claim 1, wherein: the electromagnetic directional valve is a two-position four-way electromagnetic directional valve.
8. The emergency hydraulic system of claim 1, wherein: and a normally closed emergency ball valve is connected between the port B of the electromagnetic directional valve and the port EMP of the brake oil way.
9. The emergency hydraulic system of claim 1, wherein: the hydraulic motor is a bidirectional hydraulic motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011295133.8A CN112340630B (en) | 2020-11-18 | 2020-11-18 | Emergency hydraulic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011295133.8A CN112340630B (en) | 2020-11-18 | 2020-11-18 | Emergency hydraulic system |
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| CN112340630A CN112340630A (en) | 2021-02-09 |
| CN112340630B true CN112340630B (en) | 2021-12-17 |
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| CN202011295133.8A Active CN112340630B (en) | 2020-11-18 | 2020-11-18 | Emergency hydraulic system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114014193B (en) * | 2021-12-03 | 2023-08-18 | 中船华南船舶机械有限公司 | Control method of winch braking system |
| CN114014192B (en) * | 2021-12-03 | 2023-04-07 | 中船华南船舶机械有限公司 | Winch braking system |
| CN115818489A (en) * | 2022-09-27 | 2023-03-21 | 中船华南船舶机械有限公司 | Control method of constant tension system of crane |
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| CN112340630A (en) | 2021-02-09 |
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